Answer:
3000J
Explanation:
Given parameters:
mass = 400kg
speed = 15m/s
Unknown:
P.E at the highest point of the roller coaster = ?
Solution:
Due to the law of conservation of energy, the potential energy at the highest point can be solved using the formula of the kinetic energy
Potential energy = mv²
m is the mass
v is the velocity
Potential energy = x 400 x 15 = 3000J
Explanation:
The momentum is given by the following equation:
(1)
Where:
is the mass of the object
is the velocity of the object
Finding the velocity from (1):
(2)
<u>Finally:</u>
>>>This is the velocity of the object
Answer: (d)
Explanation:
Given
Mass of object
Speed of object
Mass of object at rest
Suppose after collision, speed is v
conserving momentum
Initial kinetic energy
Final kinetic energy
So, it is clear there is decrease in kinetic energy . Thus, energy decreases and velocity becomes 2 m/s.
This question involves the concepts of the law of conservation of momentum.
The magnitude of the final momentum of the eight ball is "0.22 N.s".
According to the law of conservation of momentum:
where,
= initial momentum of the cue ball = 0.23 N.s
= initial momentum of the eight ball = 0 N.s (since ball is initially at rest)
= final momentum of the cue ball = 0.01 N.s
= final momentum of the eight ball = ?
Therefore,
Learn more about the law of conservation of momentum here: